Which of the following is classified as a narrow body aircraft?

The B757 is classified as a narrow-body aircraft due to its design and capacity specifications. Narrow-body aircraft typically have a single aisle and are used for shorter to medium-haul flights. The B757, with its typical single aisle configuration, accommodates fewer passengers compared to wide-body aircraft, typically carrying between 200 to 280 passengers depending on the specific model and configuration.

In contrast, the other aircraft listed, such as the A330, B767, and B777, are considered wide-body aircraft. These have two aisles and can accommodate a larger number of passengers, often exceeding 300 in a typical configuration. Wide-body aircraft are usually designed for longer distances and higher passenger capacity, which distinguishes them significantly from narrow-body counterparts like the B757. Understanding this classification helps in appreciating the design and operational purposes of different types of aircraft in commercial aviation.